Subtronics India Pvt. Ltd. Manufactures Railway Type Tail Lamp Flasher with 16 Bright LEDS. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. Railway Type Tail Lamp Flasher with 16 Bright LEDS requires an operating voltage of 6 volts D.C with four "D" size batteries. It delivers seventy flashes per minute, which are adjustable in nature. This machine has indicator L.E.D. For displaying low battery indication. The bright flashes of Railway Type Tail Lamp Flasher with 16 Bright LEDS are visible from a long distance.